SaaS/PaaS dev / ops pinch hitter writing PHP since 5 went beta (that was June 2004), I teach LEMP, MEAN, Haskell, maybe a little RoR / Django / Java. .NET too I guess, considering that's what I did in college. Realtime and persistent connections for device agnostic app dev, 1.7 million concurrent connections - who says Node doesn't scale - setting up build servers, metrics, instrumentation, chef or puppet, Vagrant, stack deploy and workflow automation, release engineering, continuous integration, caching, streams, pub sub, high availability, and eventual integrity; sockets are my little friend. App sec / OSCP, shodan contributor. I architect. I implement. I hacked NASA with a toaster.